Abstract: A temperature-adjusted sampler for liquids, gases or other fluids including a hollow needle in steel or another metal on which a heating is deposited so as to be electrically insulated, characterized in that the hollow needle is coated with an electrically insulating layer which has deposited thereon in complete intimate contact a thin, electrically conducting heating layer.

Abstract: A pipet provides for dispensing a fluid medium into an open-ended collection container including an improved dripless tip. The pipet includes a tip body with a cross shaped passage structure that spans the length of the tip body. This cross shaped passage structure is designed to contact the liquid medium that passes into the tip and onto the open distal end of the tip and prevent unwanted dripping therefrom.

Abstract: A battery powered, microprocessor controlled portable electronic pipette, comprising a hand holdable housing supporting a battery, a linear actuator for driving a plunger lengthwise in a cylinder to aspirate and dispense fluid into and from a pipette tip extending from the housing and a control circuit for the linear actuator. The linear actuator is powered by the battery and comprises a stepper motor with current receiving windings for electromagnetically driving a rotor to impart the lengthwise movement to the plunger.

Abstract: A work station for simultaneously performing multiple assays includes a base structure, a receptacle rack assembly received within a receptacle rack well formed in the base structure, a pipette tip rack assembly received within a pipette tip rack well formed in the base structure, a multiple conduit substance transfer device, and substance transfer device positioning structure. The receptacle rack assembly holds a plurality of receptacles in which a plurality of individual assays are performed, and the pipette tip rack assembly holds a plurality of contamination limiting pipette tips. The substance transfer device is capable of simultaneously dispensing substances into two or more receptacles or simultaneously removing substances from two or more receptacles. Alternatively, the substance transfer device is capable of simultaneously dispensing substances into two or more receptacles, and, at about the same time, simultaneously removing substances from two or more receptacles.

Abstract: An air displacement pipette having axially spaced annular sealing and frusto-conical lateral support zones and regions on the pipette's mounting shaft and tip, respectively, in combination with structure for insuring uniform depth of mounting shaft penetration into the pipette tip to maintain uniform tip interference with the mounting shaft as successive tips are mounted on and ejected from the mounting shaft whereby the pipette tip is easily and firmly mountable on and ejectable from the pipette tip mounting shaft by the application of reduced user generated axial forces.

Abstract: A plastic pipette tip easily and firmly mountable on and easily ejectable from a pipette mounting shaft of a pipette by application of relatively small axial mounting and ejection forces of about six and three (3) pounds respectively. The pipette tip includes a tubular proximal portion comprising (i) a frusto-conical open upper end portion having an inner diameter at its upper end greater than the diameter of a mounting shaft of the pipette to which the pipette tip is to be mounted, (ii) a hollow mid-portion and (iii) an annular sealing region at a junction of the open end and mid-portions. The annular sealing region has an inner diameter less than “x” and is designed to engage a lower end of a sealing zone of the mounting shaft to stretch radially outward as the mounting shaft is guided and stably oriented in the proximal portion thereby creating a fluid tight seal between the sealing zone and the sealing region.

Abstract: A burette tip (1) for metering a titrating agent consists essentially of a burette body (10) with a seat (3) for a membrane and with such a membrane (2). The burette tip (1) comprises, for protecting the membrane (2) and the seat (3) against mechanical damage, a covering (4, 5, 15) which at least partly encloses and covers the membrane (2) and the seat (3). The membrane (2) is clamped between the burette body (10) and a cover part (5) and is held in the burette body (10).

Abstract: An air displacement pipette having axially spaced annular sealing and substantially cylindrical lateral support zones and regions on the pipette's mounting shaft and tip, respectively, in combination with structure for insuring uniform depth of mounting shaft penetration into the pipette tip to maintain uniform tip interference with the mounting shaft as successive tips are mounted on and ejected from the mounting shaft whereby the pipette tip is easily and firmly mountable on and easily ejectable from the pipette tip mounting shaft by the application of axial mounting and ejection forces of about two pounds and one pound, respectively.

Abstract: An air displacement pipette having axially spaced annular sealing and substantially cylindrical lateral support zones and regions on the pipette's mounting shaft and tip, respectively, in combination with structure for insuring uniform depth of mounting shaft penetration into the pipette tip to maintain uniform tip interference with the mounting shaft as successive tips are mounted on and ejected from the mounting shaft whereby the pipette tip is easily and firmly mountable on and easily ejectable from the pipette tip mounting shaft by the application of axial mounting and ejection forces of about two pounds and one pound, respectively.